JPH0362462B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a vertical pulverizer that pulverizes cement raw materials, coal, chemicals, etc. through cooperation between a rotating table and pulverizing rollers.

[Prior Art] Vertical pulverizers equipped with a rotary table and rollers are widely used as a type of pulverizer for finely pulverizing powders such as cement raw materials, coal, and chemicals. This type of crusher consists of a disk-shaped rotary table that is driven by a motor with a reducer to rotate at low speed in the lower part of a cylindrical casing, and a part that divides the outer circumference of the upper surface into equal parts in the circumferential direction, which is pressed by hydraulic pressure or the like. It is equipped with a plurality of rollers that are driven to rotate.

In this vertical crusher, powder as a raw material is supplied to the center of the rotary table through a supply pipe, and when the table rotates, the powder is subjected to centrifugal force in the radial direction of the table, and as it slides on the table, it is rotated by the table in the direction of rotation. It receives the force, slides between it and the table, and rotates somewhat slower than the table rotation speed. The above two forces, that is, the forces in the radial direction and the force in the rotational direction are combined, and the powder moves to the outer periphery of the rotary table while drawing a spiral trajectory on the table. Since the roller is in pressure contact with this outer periphery and is rotating, the particles with spiral lines enter between the roller and the rotary table from a direction forming a certain angle with the roller axis direction and are bitten. Smash.

On the other hand, hot air is guided to the base of the casing by a duct, and this hot air is passed through an air blowing passage (in this specification, this passage is referred to as a ring) between the outer peripheral surface of the rotary table and the inner peripheral surface of the casing. (It is called the spatial part.)
As the fine powder is blown up, it rises inside the casing while being dried, and is discharged from the discharge port as a mixture with hot air and sent to the next process.

By the way, it is rare for the material to be crushed supplied to the crusher to be crushed into the fine powder particle size required by this crusher by being subjected to the crushing action by the crushing rollers only once, and the material may fall to the center of the rotary table. Not all of the crushed material is bitten by the crushing rollers, so even if the powder and granules that reach the outer peripheral edge of the rotary table rise up on the hot air current blowing up from the annular space, they will not be able to be crushed by the crusher. By the time the particles reach the separator installed at the top, depending on their particle size, they may fall or be classified and removed by the separator and returned to the rotary table.

In this way, the material to be crushed, which is constantly fed into the crusher, rises from the rotary table to the separator or passes through the rotary table until it reaches the desired fine powder particle size to become the final product and flows out of the crusher. The powder is gradually crushed by falling from the middle of the separator many times until it reaches the desired particle size.

[Problems to be Solved by the Invention] In the conventional vertical crusher as described above, on the table, a larger amount is produced on the biting side of the roller than on the opposite side due to the dam action (damming effect) of the roller. The material to be crushed is swept into the annular space. Among the objects to be crushed that are pushed into the annular space on the biting side of the rollers, those with large particle sizes become waste stones in excess of what is necessary and fall down the annular space, increasing the amount of waste stones and disposing of them. Increase workload. Further, by forcing a large amount of material to be crushed into the annular space, the ventilation pressure loss of the annular space increases, thereby increasing the fan power.

In addition, in conventional vertical crushers, the hot air is blown up from the annular space in a nearly vertical direction, or when the annular space is provided with a plurality of blades that are inclined in the circumferential direction, the inner peripheral surface of the casing It was blown up in the direction of the wind. Therefore, the particles blown up by the hot air, even those whose particle size is larger than the product particle size, are likely to be carried by the air current to the separator, which tends to increase the separator load unnecessarily and reduce the classification efficiency.

[Means for Solving the Problems] The present invention comprises a casing having an outlet at the top for fine powder conveyed by airflow, a separator provided at the upper part of the casing, a rotary table installed in the casing, and a A pulverizer comprising a plurality of pulverizing rollers disposed on the rotary table, and in which an annular space for blowing up airflow is formed by going around the rotary table, the pulverizing roller is A plate-shaped body that makes the width of the biting side narrower than that of the biting side is disposed on the casing side, and an inclined plate that approaches the casing side as it goes downward is provided on the lower surface side of this plate-shaped body. This is a vertical crusher.

[Operation] In the vertical crusher of the present invention, a large amount of hot air is blown up on the biting side of the annular space. Therefore, even if a larger amount of the material to be crushed is swept away on the biting side than on the anti-biting side, it can be sufficiently transported by airflow.

Furthermore, in the present invention, since the inclined plate is provided, the hot air is blown up toward the center of the table. As a result, among the particles carried by the airflow, coarse particles fall on the table as if in a parabola on the way, without even reaching the separator.

As described above, in the vertical crusher of the present invention, the presence of the plate-shaped body and the inclined plate reduces the amount of stone discharged, increases the amount of material to be crushed into the rollers, and improves the crushing efficiency.

This results in a reduction in pressure loss in the annular space, especially in the roller biting area, and a corresponding reduction in fan power.

This results in a reduction in separator load and an increase in classification efficiency.

The following effects are produced.

[Example] FIG. 1 is an overall schematic vertical sectional view showing an example of a vertical crusher according to the present invention.

In FIG. 1, a crusher 1 includes a casing 2 that houses the entire crushing section such as a rotary table 3, which will be described later.
0, and this casing 20 includes a lower casing 2 formed in a cylindrical shape and fixed to the floor surface.
0a, and an internal cone 20 with a circular cross section and a center drawing.
The casing includes a middle casing 20b having an inner casing 20b and an upper casing 20d joined to the upper end of the middle casing 20b.

A reducer 2 with a motor is disposed in the center of the lower casing 20a, and a rotary table 3 formed in a disc shape is attached to the output shaft facing upward. It is driven and rotates clockwise when viewed from above in FIG. Reference numeral 5 denotes a plurality of roller boss arms, and a plurality of roller boss arms are arranged at the upper outer circumferential end of the rotary table 3, and a truncated conical crushing roller 4, which is pivoted in a substantially horizontal position, is pivotally connected to the lower end of each roller boss arm. There is.

A pressure frame 6 having an annular shape (an annular shape in this embodiment) is fixed to the upper surface of the upper inner peripheral end of the roller boss arm 5 by means such as bolt tightening, and a plurality of crushing rollers 4 and a roller The boss arm 5 and the pressure frame 6 are integrally formed and mounted on the upper surface of the rotary table 3. On the other hand, the upper outer peripheral end of each roller boss 5 is rotatably connected to a hydraulic cylinder 10 via a connecting rod 8, a turnbuckle 9, and a cylinder rod 10a by a pin 7 and a fork end 7a, and the lower end of the hydraulic cylinder 10 is connected to a rotary pin. 11 and a rotating seat 12, it is connected to a base plate 13.

Each crushing roller 4 is rotatably supported on a roller boss 5 via a roller shaft 4a, and its peripheral surface is in contact with the outer peripheral surface of the upper end of the rotary table 3, so that it is driven as the rotary table rotates. It is rotatable.

On the other hand, a discharge port 22a is provided above the center of the rotary table 3, and a final fine powder discharge pipe 2 is provided.
2 are connected. Further, the raw material supply pipe 16 is inserted from above the casing through the ceiling wall of the discharge pipe 22 into the discharge port 22a, and is arranged so that its lower end reaches near the lower part of the separator 15. This raw material supply pipe 16 is supported by the upper casing 20d via a discharge pipe 22, and around this raw material supply pipe 16, a separator 15 formed of an inverted conical cylinder is connected to the middle casing 20b by a stay (not shown). is supported by On the outer peripheral surface of the upper end of this separator 15,
A plurality of movable vanes 15a for imparting swirling force to the incoming dust gas are arranged evenly in the circumferential direction, and can be freely rotated and adjusted from the outside by a shaft 15b supported at one end by a bearing 15c and a handle 15d. It's summery.

A duct 18 is located below the outer periphery of the rotary table 3.
An annular hot air passage 21 is provided which is connected to the hot air generator by a hot air generator. Above the hot air passage 21, an inner circumferential wall 14a and an outer circumferential wall 14b are provided between the rotary table 3 and the casing 20a. An annular space portion 14 is defined by. This annular space 14 includes a plurality of plate-like bodies 40 and an inclined plate 41 as described later.
is disposed, and the width of the annular space 14 on the biting side of the roller 4 is made larger than the width on the anti-biting side.

In addition, a discharge chute 19 is installed at the bottom of the hot air passage to temporarily discharge foreign matter during crushing and surplus crushed materials in the event of overload, and is installed through a discharge door 19b that is rotatable around a rotating pin 19a. It has a structure that allows it to be taken out.

As shown in FIGS. 2 and 3, a drawing board 42 is fixed to the outer peripheral edge of the table, sealing the space between the side periphery of the table 3 and the circumferential wall 14a. The plate-like body 40 is fixed to the outer circumferential wall 14b, and an inclined plate 41 is fixed to the lower surface side thereof. This inclined plate 41
has its lower end inclined towards the casing.

Note that FIG. 2 is a plan sectional view showing only the arrangement relationship of the table, rollers, inner peripheral wall, outer peripheral wall, and plate-shaped body, and FIG. 3 is a sectional view taken along the line -- in FIG.

The operation of the crusher configured as above will be explained next.

After starting the reducer 2 with a motor to rotate the rotary table 3, the material to be crushed is supplied from the supply pipe 16 to the center of the upper surface of the rotary table 3 while maintaining airtightness by a conveyor such as a conveyor (not shown). Then, due to the rotation of the rotary table 3 and the centrifugal force of the rotation, the object to be crushed draws a spiral trajectory and moves toward the outer periphery of the rotary table 3. rotary table 3
Since the crushing roller 4 is rotating on the outer periphery of the
The moved object to be crushed is caught between the crushing roller 4 and the rotary table 3, and is crushed into fine powder by compression, impact, and shearing action. The pulverized material or the particles that are moved to the side of the roller without being bitten by the roller due to the dam action of the roller 4 move toward the edge of the table, climb over the drawing board 42, and form an annular shape. The space part 14 is reached.

Hot air sent through the duct 18 by the hot air generator blows up from the hot air passage 21 into the annular space 14. As a result, the fine powder and some intermediate-diameter particles generated by the crushing move up inside the crusher along with the hot air around the entire circumference of the table 3. Therefore, as described above, on the biting side of the roller 4, a larger amount of particles reaches the annular space 14 than on the anti-biting side. Since the width of the opening is larger than that on the opposite side, a sufficient amount of hot air can blow through.

As shown in FIG. 3, the rising direction G of this hot air is inclined toward the center of the table 3. Therefore, the intermediate particles B having a large particle size fall onto the table 3 in a parabolic manner, and only a small amount of the intermediate particles reach the separator 15. On the other hand, the fine powder A rises between the separator 15 and the inner cope 20c of the casing, changes its course direction horizontally near the top of the upper casing 20d, and spirals along the set inclination of the movable vane 15a. Inflow. In this way, the fine powder that has reached the desired fine powder particle size, which has been classified by the centrifugal classification action of the separator, is sent to the next step via the discharge pipe 22. On the other hand, coarse powder that does not reach the fine particle size slides down the inner surface of the separator and
It accumulates near a flap 15f whose upper end is rotatably supported on a skirt 15e fixed to the side wall of the 6, and slides down the inner surface of the lower chute 15g while pushing this flap 15f away by the action of gravity.
It falls onto the top surface of the rotary table 3.

A small amount of coarse particles that have fallen into the annular space 14 pass through the annular space 14 and are stored on the discharge chute 19 . When a predetermined amount or more of waste rock is stored, the discharge door 19b is opened and the waste rock is taken out. In the present invention, the amount of waste stone is significantly reduced by providing the raw material guide member 30, and therefore the frequency of work to remove the waste stone is also extremely low.

In the present invention, coarse particles may be recirculated into the vertical crusher by installing a conveyance device such as a bucket elevator so as to connect the discharge port and the chute.

In the embodiment described above, since the inner circumferential wall 14a is provided, the annular space 14 can be easily changed significantly.

FIG. 4 is a diagram showing a detailed embodiment of the invention, showing a plane similar to FIG.

As shown in FIG. 4, when carrying out the present invention, it is preferable to set the opening width of the annular space 14 by arranging a plurality of plate-like bodies 40. In this case, by preparing plate-like bodies of different sizes and replacing them as appropriate, the annular space 1
The width of 4 can be freely set. Furthermore, the fourth
The figure shows an example of installing a plate-like body when four rollers are installed. Further, FIG. 5 is a plan view showing an example of the shape of the plate-shaped body 40.

In the present invention, the liner of the rotary table may not be of the flat type, but may be of the inclined type or dish type, and the corresponding crushing roller may be changed to a type that is compatible with these types. Furthermore, various types of separators such as a rotating blade type can be used as the separator.

[Effects of the Invention] As is clear from the above description, the crusher of the present invention increases the opening width of a predetermined portion of the annular space and is provided with an inclined plate, thereby improving crushing efficiency,
Effects such as a reduction in fan power cost and a reduction in waste stone processing cost can be obtained.

[Brief explanation of drawings]

FIG. 1 is an overall schematic sectional view showing an embodiment of a vertical crusher according to the present invention, FIGS. 2 and 4 are plan sectional views of the same essential parts, and FIG. 3 is a sectional view taken along the line shown in FIG. 2. figure,
FIG. 5 is a plan view of the plate-like body. 1... Vertical crusher, 3... Rotating table, 4...
...Crushing roller, 6...Pressure frame, 14...Annular space, 15g...Separator chute, 22a...
Exhaust port, 22b... airflow passage, 40... plate-shaped body,
41... Inclined plate.

Claims (1)

[Scope of Claims] 1. A casing having a discharge port for fine powder transported by airflow at the top, a separator provided at the upper part of the casing, a rotary table installed in the casing, and a separator disposed on the rotary table. A pulverizer comprising a plurality of pulverizing rollers, and an annular space for blowing air flowing around the table is formed between the rotary table and the casing; A plate-like body whose width on the anti-biting side is narrower than the width on the biting side is provided on the casing side, and an inclined plate that approaches the casing side as it goes downward is provided on the lower surface side of this plate-like body. A vertical crusher featuring: 2. Claim 1, characterized in that a cylindrical body that goes around the table is provided on the table side of the annular space, and a space between the cylindrical body and the table side periphery is sealed with a drawing board. vertical crusher.